We bring quality to light. Spectro 320 Scanning Spectrometer

Transcription

1 We bring quality to light. Spectro 320 Scanning Spectrometer light measurement

2 Instrument description Applications Spectroradiometry NVIS Display measurements Specifications Key features at a glance Fast-Scan Technology offers short measurement times with very high accuracy and large signal dynamic range Broad spectral range, up to nm Single and double monochromator versions Integrated density filter wheel facilitates an extremely wide intensity measurement range Programmable spectral resolution from 0.1 to 20 nm The flagship among spectrometers leaves nothing to be desired The Spectro 320 has the reputation of being a universal talent among spectrometers. Its Fast-Scan Technology permits a measuring speed and precision that is far higher than those of conventional stepper-motor driven monochromators. The visible spectrum can be measured within just a few seconds. The Spectro 320 has been designed to combine the advantages of the large signal dynamic range and high spectral resolution of a scanning spectrometer with the short measuring times of array spectrometers. The Spectro 320 also has an enormous spectral range. In the maximum configuration it is possible to scan from 190 to 5000 nm in a single scan. The spectrometer can be optimally configured to meet any requirement. The optical analysis of LEDs or fluorescent lamps, high-resolution spectral measurements of plasma sources, and transmission and reflection measurements are just some of the examples for its wide range of applications. The Spectro 320 is supplied in a single monochromator configuration or as a double monochromator (Spectro 320D). The extremely low stray light of the double monochromator facilitates even very demanding measurement challenges. The Spectro 320D is therefore used as a reference instrument by many national and calibration laboratories. A double monochromator is the measuring instrument officially recommended for assessing the photobiological safety of lamps. 2 Angle encoder Grating arrangement 2 Only double monochromator Grating arrangement 1 DC-Motor Detector Data acquisition, processing unit Scanning spectrometer concept Fast-Scan Technology Instrument Systems invented the Fast-Scan Technology that features a DC motor rotating the diffraction grating. A high-precision angle encoder is additionally attached to the rotation shaft of the grating turret to identify the correct position. The encoder synchronizes data acquisition during the scan and provides superb absolute wavelength accuracy over the entire spectral range. Fast-Scan Technology delivers a high level of precision, has the appeal of simplicity, and makes the Spectro 320 the fastest multi-detector spectrometer in its class.

3 Single monochromator The high-precision optical components of the asymmetric Czerny-Turner monochromator are optimally matched. Monochromator, power supplies and electronics are incorporated in a compact enclosure. The software is responsible for the control and correct interaction of the diffraction gratings, slits, detectors, the density and order-sorting filter wheel. Downstream from the exit slit, software-controlled reflecting mirrors direct the radiation onto the specified detector. The optional Optical Port provides an additional optical monochromator output and a detector input. 1 Detector 2 3 Electronic and Processing unit Optical Port (optional) Ordersorting filter Exit slit ra tin g Entrance slit 3 2 g1 G ting G ra ti n Gra The Spectro 320 can accommodate up to three different detectors and gratings that are automatically switched by software during the scan. Instrument Systems offers a wide range of detectors, which are matched optimally with the gratings. This ensures a uniform spectral sensitivity function. Semiconductor detectors made of silicon (Si), indium-galliumarsenide (InGaAs), lead sulfide (PbS) and lead selenide (PbSe) are supplied alongside a selection of different photomultipliers (PMT). Some of the detectors are cooled as standard or optionally, and this further reduces signal noise. The spectral resolution and the light throughput can be varied using a software selectable input and output slit wheel. The slit wheels provide up to eight different slit widths to guarantee very high wavelength accuracy and reproducibility. If the slit width is changed, there is no wavelength offset of the spectrum, as may be the case with continuously adjustable slits. Power supply Fiber input Spectro 320 single monochromator Double monochromator Superimposing two single monochromators creates a compact double monochromator configuration with very low stray light and extremely high dynamic measuring 1 Detectors and gratings Slit wheels Density filter Detector 2 range. The two grating arrangements share the same axis of rotation. This guarantees short scan times at high stability and wavelength accuracy, as well as eliminating the problems associated with synchronizing the two monochromators. The double monchromator is designed in a subtractive configuration. Hence, the spectrometer s residual dispersion at the exit slit is zero. 3 A density filter wheel positioned directly behind the optical input reduces excessive signal intensities and therefore permits an extremely large intensity measuring range. Angle encoder Focusing and collimating mirror Order-sorting filter Density and order-sorting filters Higher diffraction orders of the grating are suppressed by an order-sorting filter wheel directly after the exit slit. Depending on the wavelength position, the software automatically selects the correct order-sorting filter. Intermediate slit Exit slit Fiber input Density filter Focusing and collimating mirror Entrance slit Grating assembly Spectro 320D double monochromator 3

4 Instrument description Applications Spectroradiometry NVIS Display measurements Specifications Software control and interfaces The Spectro 320 is fitted with a fiber-plug (PLG) input developed by Instrument Systems. Appropriate PLG adapters can be supplied for all standard connectors of single-mode and multi-mode fibers and for fiber bundles. The complete range of accessories like optical probes or measurement adapters can therefore be connected. All functions of the Spectro 320 are controlled by an RS-232 interface or optionally by an IEEE-488 bus. The Windows-compatible SpecWin Pro software is supplied for laboratory applications. It has a particularly userfriendly graphical interface with extensive options for display and analysis of the measurement results. A Direct Fiber Input (DFI) for the monochromator is optionally available. In this case, the focusing optics and the density filter wheel are bypassed and the end of the fiber is positioned directly in front of the entrance slit. Ideal measuring processes are created by the many different alternatives for configuring the parameters. In addition, the software offers the possibility of defining sub-ranges within the spectral range to be measured. Each of these sub-ranges can be scanned with a separate parameter set. Different detectors, scan speeds, band passes, data point increments, etc. can therefore be used to take measurements in such sub-ranges. G ra tin g 3 G ra ti n g1 Optical input A Windows-DLL and LabVIEW driver are supplied for integration into a customer-specific measuring environment. The focusing optics with density filter wheel are bypassed by the DFI and the end of the fiber is positioned directly in front of the entrance slit. This option is recommended if extremely low intensities need to be measured. If the fiber bundle has a suitable numerical aperture and converted cross-section, the full height of the slit can be used to significantly increase the measuring sensitivity. Optical Port The optional Optical Port offers the possibility to extract and launch light radiation in or out of the system. It is located between the monochromator and the detector unit. This enables a large number of different applications, e.g. spectral-sensitivity measurements of detectors, using the Spectro 320 as a rapidly tunable wavelength filter or to generate monochromatic radiation. 4 Measuring parameter dialog for software SpecWin Pro. The user interface permits a wide range of configuration options, e.g. the definition of sub-ranges.

5 Instrument description Applications Spectroradiometry NVIS Display measurements Specifications A spectrometer with a lot of talent The Spectro 320 is supplemented by a comprehensive selection of measuring adapters to create a turnkey system for a wide portfolio of different measuring assignments. The adapters are connected by optical fibers and can be exchanged without loss of calibration at any time. Transmission and reflection Applications in spectrophotometry, such as transmission and reflection measurements at optical filters and coatings are also a domain of the Spectro 320. Comprehensive accessories mean that measurements for specular and diffuse geometry can be taken easily, quickly and with a high level of accuracy. High-resolution spectral measurements The Spectro 320 comes in a variety of different models spanning UV to IR. This choice along with the exceptional precision and flexibility enables the spectrometer to carry out virtually any assignment in the area of highresolution spectral measurements. One example is measuring plasma and fluorescence lines that require a combination of high optical resolution with a wide spectral range. The choice of accessories includes the ISP 150 integrating sphere for diffuse reflection and transmission measurements, the TRA 100 transmission adapter for specular transmission measurements and the GON 360 goniometer for specular transmission and reflection measurements at variable angles. Fiber-optic metrology Determining the absorption of single-mode fibers in the ultra-violet requires very high measuring dynamic range and signal sensitivity. The model of the Spectro 320 optimized for UV with cooled PMT is ideal for this application. The entrance slit guarantees a high spectral resolution even if fibers with large core diameter are connected. In contrast, optical spectrum analyzers for communications engineering are based on a design where the end of the fiber generally serves as the entrance slit. GON 360 for transmission and reflection measurements at variable angles 5

6 Instrument description Applications Spectroradiometry NVIS Display measurements Specifications The reference in spectroradiometry The Spectro 320 excels in spectroradiometric applications. Its robust enclosure provides a platform for extremely stable measurements and absolute wavelength accuracy even over a broad temperature range. These advantages combined with its very wide spectral range make the Spectro 320 ideal as a reference instrument in numerous national and calibration laboratories, and in research and development. Accessories Instrument Systems supplies a comprehensive selection of accessories to equip the Spectro 320 as the instrument of choice for all forms of analysis involving spectral light measurements. These include integrating spheres for determining the total radiant power or luminous flux of light sources. Optical probes from the EOP and ISP 40 series can be connected for measuring irradiance and EOP optical probes Model Acceptance angle Cosine correction Throughput Spectral range Application EOP-120 ± 6 Average Good nm Universal EOP-140 ± 3 Low High nm Low light levels EOP-146 ± 32 Good Average nm Extended light sources EOP-350 ± 4 Low Good nm Infrared range EOP High nm Direct solar radiation, 5.7 aperture angle ISP 40 ± 55 Very good Low nm Solar radiation Selection of available optical probes with qualitative assessment of cosine correction and light throughput. The specified acceptance angle (measured using the photometric integral and the radiometric integral between 1000 nm and 1500 nm for EOP-350, respectively) applies for deviations from the cosine behavior of < 5 %. 6

7 illuminance. A variety of different versions are offered with different light throughput, cosine correction and the applicable spectral range. Photobiological safety The double monochromator version of the Spectro 320 permits measurements under the EN standard Photobiological Safety of Lamps and Lamp Systems. The superior wavelength accuracy and in particular the excellent low stray light with the associated large dynamic measuring range make the Spectro 320D the spectroradiometer of choice. For the UV and the visible spectrum, the standard explicitly recommends a double monochromator as a measuring unit. Furthermore, Instrument Systems supplies the appropriate accessories for irradiance and radiance measurements required by the standard. The broad spectral range combined with the high spectral resolution offers ideal measuring conditions for use in photovoltaics. Applications focusing on the ultraviolet spectral range, such as the characterization of weathering booths, require a measuring instrument with particularly low stray light. UV-B monitoring The Spectro 320D is ideal for carrying out UV-B measurements. The basic conditions for precise determination of the solar UV-B irradiance are a very high wavelength accuracy and extremely low stray light. This is the only way to precisely measure the steep slope of the UV-B edge. The innovative Fast-Scan Technology of the Spectro 320 and the double monochromator design meet these very stringent requirements. Spectral irradiance / W / (m2nm) Measuring adapter for the assessment of photobiological safety in conformity with EN Wavelength / nm Measurement of the UV-B spectral irradiance of solar radiation. The dynamic measuring range covers 7 decades. Solar simulators The Spectro 320 allows all measurements for characterization of solar simulators to be carried out with ease Spectral irradiance / % 280 Another benefit of the Spectro 320D for UV-B monitoring is provided by the high signal sensitivity combined with the short measuring times. The lens system optimized for light throughput and a continuous data acquisition by the cooled photomultiplier permits short read-out times and prevents undesired smoothing of the UV-B edge Wavelength / nm Spectrum of a solar simulator. The spectral range can be recorded from 190 to 2500 nm in less than one minute depending on the measuring adapter used. 7

8 Instrument description Applications Spectroradiometry NVIS Display measurements Specifications High-end LED and display measurements Maximum accuracy for colorimetric measurements The Spectro 320 allows the determination of all photometric parameters and spectral characteristics of LEDs. The superior precision of the Spectro 320 brings substantial benefits to the world of research and development of LEDs. The particularly low stray light achieves very high measuring accuracy for color coordinates, dominant wavelength, and color temperature. Even steep slopes of narrow-banded LEDs can be measured with exceptional accuracy. One example is provided by the analysis of the spectrum of a blue LED in logarithmic scaling. The high dynamic measuring range of the Spectro 320 is up to 7 decades and permits precise analysis of the weak peak at 367 nm in the short wavelength slope of the LED. The minimum between the main peak and the subsidiary peak is 5 orders below maximum intensity. Technical specifications for LED measurements Model 100 Intensity / % 10 VIS Luminous intensity 10 μcd 25 kcd 5 μcd 25 kcd Luminous flux 0.15 mlm 500 klm 0.07 mlm 500 klm Measurement uncertainty * Wavelength / nm The spectrum of a blue LED in logarithmic scaling 8 UV Sensitivity * Luminous intensity Luminous flux Dominant wavelength ± 0.3 nm Color coordinates (x,y) ± *1 100-times the noise equivalent photometric value. Minimum value applies to the Spectro 320 with the largest slit, PMT (HV level 4) with GaAs photocathode. Luminous intensity and luminous flux measured with ILED-B adapter LED-436 and integrating sphere ISP 250. * 2 Minimum attainable, expanded measurement uncertainty related to twofold standard deviation. Only applies to the measurement and calibration conditions used and for adequate signal dynamic range. Measured for diffuse LEDs, without density filter and with a bandpass 5 nm.

9 The reference instrument among NVIS spectroradiometers The Spectro 320 has achieved the international status of a reference instrument for testing night vision compatibility (NVIS) of displays and panel graphics in conformity with MIL-L-85762A and MIL-STD-3009 standards. When testing night-vision displays, the measurement system must be capable of capturing the huge difference in dynamic range between the eye (visible spectrum) and the night-vision goggles (near infrared spectrum) in a single scan. This measurement scenario demands a premium performance spectroradiometer with very low stray light and wide signal dynamic range of at least 5 decades. The TOP 200 features a lens, an aperture disk (direct viewing style optics) and an integrated view-finder camera. Software allows to select up to six different measuring-spot sizes. The smallest measuring spot is only 75 µm in diameter. The patented mode mixer of the fiber-optic coupling of the spectrometer with the TOP 200 compensates for changes in position of the fiber. It also acts as a polarization scrambler that permits accurate measurements on LCD displays. Technical specifications for NVIS measurements Model DTS NVIS Spectral range nm Number of grating lines / Blaze 651 l/mm / 730 nm Detector *1 Cooled photomultiplier with GaAs photocathode Wavelength accuracy ± 0.2 nm Spectral resolution 8.57 nm Noise-equivalent radiance Sensitivity luminance *2 *3 Measuring time NVIS radiant intensity W/cm2 sr nm 1.5 mcd/m2 1 2 min. Measurement uncertainty Luminance *4 Spectral radiance NVIS measuring mode of the SpecWin Pro software with functions like live image display or automatic Pass/Fail test Instrument Systems has carried out groundbreaking pioneer work with the development of a turnkey system based on the Spectro 320. The DTS NVIS Display Test System comprises the optimized Spectro 320 with a cooled PMT, the TOP 200 Telescopic Optical Probe and a special NVIS measuring mode of the SpecWin Pro software. The high scan speed and signal sensitivity of the DTS NVIS permit very precise determination of NVIS radiance values (NVIS-A/-B/-C) within just one minute. ±3% *5 ±4% Color coordinates (x,y) *4 ± Dominant wavelength *4 ± 0.3 nm Polarization sensitivity <1% Telescopic Optical Probe TOP 200 Aperture diameter / 0.25 / 0.5 / 0.8 mm Measuring-spot diameter with HRL90 lens / 0.15 / 0.3 / 0.5 mm Stray light HRL90 lens at mm measuring-spot diameter approx. 0.1 % Diameter / length of optical fiber 1 mm / 2.5 m Dimensions for basic unit (L x H x W) mm x 136 mm x 98.3 mm Weight 2.2 kg *1 Internal cooler to -5 C is standard. * 2 Measured at 600 nm with maximum slit size, aperture diameter 0.8 mm, slowest scan speed, data point increment 5 nm and without averaging. * times the noise equivalent photometric value. Measured with maximum slit size, aperture diameter 0.8 mm, slowest scan speed, data point increment 5 nm and without averaging. *4 Minimum achievable, extended measurement uncertainty applied to a twofold standard deviation. Only applies to the measuring and calibration conditions used and for adequate signal dynamic range. * 5 Immediately after calibration relative to the calibration standard. The DTS 320 turnkey system for NVIS applications with TOP 200 Telescopic Optical Probe and the DTS 400 manual positioning unit from Instrument Systems 9

10 Instrument description Applications Spectroradiometry NVIS Display measurements Specifications Technical specifications Model *1 UV VIS IR1 Spectral range [nm] Detector *2 Si Si InGaAs ext. InGaAs PbS PbSe Grating lines *3 [l/mm] / Blaze [nm] 1200 / / / / / / 2000 Scan time [ms/nm] / / / / / / Spectral resolution *4 [nm] PMT PMT IR2 IR3 Wavelength accuracy *4 *5 [nm] ± 0.1 / ± 0.03 ± 0.1 / ± 0.03 ± 0.2 / ± 0.06 ± 0.5 / ± 0.1 ± 0.5 / ± 0.1 ± 0.5 / ± 0.1 Wavelength reproducibility *4 *6 [nm] ± 0.05 / ± 0.01 ± 0.05 / ± 0.01 ± 0.1 / ± 0.02 ± 0.2 / ± 0.05 ± 0.2 / ± 0.05 ± 0.2 / ± 0.05 Minimum increments for data points *4 [nm] 0.05 / / / / / / 0.05 Stray light (broadband) *7 * / / < / < < / - < / - < / - Stray light (laser) *7 * / / / / / / - Noise equivalent irradiance *7 *10 [W/m2nm] / / / / / / / / - Measuring uncertainty irradiance *11 ± 4% ± 4% ± 6% Spectroradiometry Spectrophotometry Transmission measuring accuracy *12 ± 0.1 % T ± 0.1 % T ± 0.15 % T ± 0.25 % T ± 0.25 % T ± 0.5 % T Baseline noise *13 *14 ± 0.05 % ± 0.05 % ± 0.05 % ± 0.1 % ± 0.1 % ± 0.3 % Baseline drift * % / h 0.2 % / h 0.2 % / h 0.5 % / h 0.5 % / h 1%/h Monochromator Monochromator and grating type Asymmetrical Czerny-Turner configuration, subtractive double monochromator; plane grating (standard ruled, optional holographic) Focal length, aperture number 320 mm; f / 4.6 Slit widths of the slit wheels [mm] 2 / 1 / 0.4 / 0.2 / 0.1 (additionally for SP : 0.05 / 0.02 / 0.01) Configuration of the filter wheels *15 Density filter: OD1, OD2 and OD3; order-sorting filter: different filters for suppression of higher diffraction orders Electrical data Power consumption Basic version: 65 W, when the system is fully extended: max. 130 W Power supply Broadband input 100 VAC 230 VAC 50/60 Hz PC-interface RS-232 standard; IEEE-488 Bus optional 115 or 230 VAC 50/60 Hz Miscellaneous Dimensions (H, W, D) *7 220 x 425 x 560 mm3 / 260 x 425 x 560 mm3 Weight *7 approx. 23 kg / approx. 35 kg Ambient conditions C; max. relative humidity 70 %, non-condensing Sound level max. 70 dba Applicable standards EN :2006, EN :2006, EN : Unless otherwise stated, all data relate to Spectro 320 instruments with a single monochromator. *1 Different models can be combined to configure an instrument with one, two or three diffraction gratings and detectors. *2 All other data relate to the cooled versions of detectors and to the type with GaAs photocathode for the photomultiplier. *3 The 651 / 500 or 600 / 5000 gratings can be used in VIS models and the 600 / 1000 or 325 / 2000 gratings can be used for the IR1 model with ext. InGaAs detector. *4 Typical values. The first value applies to the standard version. The second value applies in conjunction with the SP high-resolution option. *5 Applies for a small slit and for the wavelength defined centrally within the spectral range. The wavelength positioning accuracy in the monochromator mode is typically (± 0.2 / ± 0.1 nm)*4. *6 The values relate to a continuous scan for one hour. *7 The first value applies to SP320 instruments with a single monochromator. The second value applies to SP320D instruments with a double monochromator. *8 Light source radiation distribution according to the standard illuminant A. Measured relative to the peak intensity of the unweighted spectral data with the following ordersorting filters: 320 nm (for 285 nm UV model), 455 nm (for 400 nm VIS model), 1200 nm (for 950 nm IR1 model with InGaAs), 1800 nm (for 1500 nm IR model with ext. InGaAs, IR2 and IR3). The specified values are limited by the detector in the IR range. *9 Measured with the smallest bandpass and at eight-fold bandpass distance to the laser line at 633 nm for the UV/VIS models and 1152 nm for the IR1-3 models. *10 Measured with the EOP-140 optical probe and OFG-445/-465 fiber bundle in IR2 and IR3, otherwise with EOP-120 optical probe and OFG-415 fiber bundle. Measured with maximum slit size, slowest scan speed, a data-point interval of 1 nm and without averaging. The following conditions apply to the relevant models: UV, VIS: PMT with GaAs photocathode (high-voltage level 4), measurement at 600 nm; IR1, IR2, IR3: measurement at 1500 nm. *11 Minimum achievable, extended relative measuring uncertainty applied to a twofold standard deviation. Only applies to the measuring and ambient conditions used for calibration (e.g. without density filter, optimum spectral range, sufficient signal level, etc.). *12 Applies in the optimum spectral range, at 10% transmission and immediately after a 5-fold baseline scan. Measuring accuracy may be lower at the spectral ends. *13 This value is obtained without averaging and at a good signal level. This value improves with appropriate averaging (e.g. 9-fold averaging reduces noise 3-fold). *14 Typical value. Applies to LS light source after 1 hour for warming up. *15 Spectral ranges for density filters: instruments with UV range: nm; Instruments without UV range: nm. 10

11 Ordering information Order number Description Spectrometer Single monochromator Double monochromator Model Spectral range SP SP VIS nm SP SP UV nm SP SP IR nm SP SP VIS-IR nm SP SP UV-IR nm SP SP VIS-IR nm SP SP UV-IR nm SP VIS-IR1-IR nm SP UV-IR1-IR nm Options SP High-Resolution Encoder Option (expanding the spectral resolution to 0.1 nm) SP Extended InGaAs detector for IR1 models SP Additional silicon detector for photomultiplier (PMT) options SP Cooled silicon detector instead of standard silicon detector SP PMT photomultiplier with GaAs photocathode (PMT3); spectral range nm SP PMT with bialkali photocathode (PMT5); spectral range nm SP Internal PMT cooling to -5 C SP IEEE-488 Bus (in addition to the RS-232 interface) SP Optical Port (optical output and detector input) SP Direct Fiber Input (DFI) for SP320 for fiber bundle with cross-section converter SP Direct Fiber Input (DFI) for SP320D for fiber bundle with cross-section converter Complete systems DTS Complete system NVIS display measurements (optimized SP with option -213/-219/-220, including TOP200 Telescopic Optical Probe with HRL90 lens, multimode fiber and mode scrambler, SpecWin Pro software, calibration and test in conformity with MIL-L-85762A / MIL-STD-3009) SP Complete system UV-B measurements (SP with options -200/-215/-218/-220/-362, including optical probe with cosine correction, quartz fiber bundle, software and calibration) Other options and accessories are supplied for the Spectro 320 (e.g. additional diffraction gratings/pairs of gratings, light sources, optical probes, fibers, DFI adapters for different fiber plugs, etc.). Please contact Instrument Systems for assistance in configuring a system to meet your specific requirements. Instrument Systems is continually working to develop and improve products. Any technical changes, errors or misprints do not form grounds for compensation. The company s Terms of Delivery and Payment apply in all other respects. 11

12 WirWe bringen bring Qualität quality to ans light. Licht. light measurement Instrument Systems GmbH Neumarkter Str Munich, Germany Tel.: / Fax: /